I study irreversible investment decisions when projects take time to complete, and are subject to two types of uncertainty over the cost of completion. The first is technical uncertainty, i.e., uncertainty over the amount of time, effort, and materials that will ultimately be required to complete the project, and that is only resolved as the investment… (More)
I examine risk/return trade-offs for environmental investments and their implications for policy choice. Consider a policy to reduce carbon emissions. To what extent should the policy objective be a reduction in the expected temperature increase versus a reduction in risk? Using a simple model of a stock externality that evolves stochastically, I examine… (More)
This study examined whether female subjects who had balanced hormonal profiles and who were experiencing the characteristic fluctuation in estrogen and progesterone levels exhibited changes in auditory function unlike subjects who were using a low-dose combined estrogen and progesterone steroid. Threshold data at 500, 1000, and 2000 Hz and middle ear… (More)
Peripheral auditory sensitivity is documented over a 5-year period on 4 cases with otodental dysplasia. Age of onset is noted for the proband and indicates that onset of this progressive hearing loss occurs as early as the first decade. Findings suggest that the hearing loss plateaus by the fourth decade, resulting in a severe, flat, bilaterally symmetrical… (More)
Pesticide residue analysis is used to support a wide variety of activities including crop protection research, environmental monitoring, consumer protection and legislative enforcement. It is undertaken by research institutes, academic institutions, private laboratories and governmental organizations. In the developed world, pesticide residue laboratories… (More)
The CyberKnife: A frameless robotic system for radiosurgery. An analysis of the accuracy of the CyberKnife: a robotic frameless stereotactic radiosurgical system.